\documentclass[12pt, UTF8, fontset=none, a4paper, openany]{ctexbook}
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\newtheorem{theorem}{定理}[section]
\newtheorem{axiom}{公理}[section]
\newtheorem{definition}{定义}[section]
\newtheorem{lemma}{引理}[section]
\newtheorem{corollary}{推论}[section]
\newtheorem*{corollary*}{推论}
\newtheorem{example}{例}[section]
\newtheorem{proposition}{命题}[section]
\newtheorem*{remark}{注}
\newtheorem*{conjecture}{猜想}

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\title{{\Huge{\bf{离散数学}}}}
\author{}
\date{}
% linespread{1.5}
% \includeonly{09FindingTheOptimum.tex}

\begin{document}
    \maketitle
    \cleardoublepage
    \pagenumbering{roman}
    \setcounter{page}{1}
    \tableofcontents
    \cleardoublepage
    \setcounter{page}{1}
    \pagenumbering{arabic}
    \include{01LetsCount.tex}
    \include{02CombinatorialTools.tex}
    \include{03Binome.tex}
    \include{04FibonacciNumbers.tex}
    \include{05CombinatorialProbability.tex}
    \include{06IntergersDivisorsAndPrimes.tex}
    \include{07Graphs.tex}
    \include{08Trees.tex}
    \include{09FindingTheOptimum.tex}
    \include{10MatchingsInGraphs.tex}
    \include{11CombinatoricsInGeometry.tex}
    \include{12EulersFormula.tex}
    \include{13ColoringMapsAndGraphs.tex}
    \include{14FiniteGeometriesAndLatinSquares.tex}
\end{document}